CyberHunter
Local dataset, no network
// Other services

Port 212: ATEXSSTR

Port 212 is assigned by IANA to anet (ATEXSSTR).

212

How anet works

Other services
client:212anetresponse client:212anetresponse

The client sends a request to port 212 and the anet service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 212 dangerous?

We have no specific security note for port 212. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 212

ServicePortTransportDescriptionReferenceUpdated
anet 212 TCP, UDP ATEXSSTR - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 212, and is it reachable?

Linux

sudo ss -ltnup 'sport = :212'      # process listening on 212
sudo lsof -nP -i :212

macOS

sudo lsof -nP -i :212

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 212 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 212
netstat -ano | findstr :212

From another machine

nmap -p 212 -sV <host>
sudo nmap -sU -p 212 <host>
nc -zv <host> 212

Block it in the firewall

sudo ufw deny 212/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 212" -Direction Inbound -LocalPort 212 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 212 used for?

Port 212 is assigned by IANA to anet (ATEXSSTR).

Is port 212 TCP or UDP?

Port 212 is registered for TCP and UDP.

Is it safe to open port 212?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 212 is open?

On Linux run "ss -ltnup 'sport = :212'", on macOS "lsof -nP -i :212", and on Windows "netstat -ano | findstr :212" to see the local process. From another machine, "nmap -p 212 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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